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High Altitude Platform Station (HAPS)
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The ITU has identified various bands for use by High Altitude Platform Stations (HAPS), which are defined as "a station located on an object at an altitude of 20 to 50 km and at a specified, nominal, fixed point relative to the Earth."
One set of bands (47.2-47.5 and 47.9-48.2 GHz) is identified on a worldwide basis. The others apply regionally or in a subset of countries.
Although there was a flurry of activity related to HAPS beginning in the late 1990's, no HAPS systems were ever developed. As of 2015, there is renewed interest in HAPS for applications involving telecommunications from Unmanned Aerial Systems (UAS).
HAPS is declared as an application of the fixed service.
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Paired Frequency Bands |
| Paired Bands | Use | Service | Table |
| 6440 - 6520 MHz | HAPS-to-ground in 5 countries (per 5.457) | Fixed | - |
| 6560 - 6640 MHz | Ground-to-HAPS in 5 countries (per 5.457) | Fixed | - |
| 27.9 - 28.2 GHz | HAPS-to-ground in 23 countries (per 5.537A) | Fixed | - |
| 31 - 31.3 GHz | Ground-to-HAPS in 23 countries (per 5.543A) | Fixed | - |
Frequency Bands |
| Band | Use | Service11 | Table |
| 1885 - 1980 MHz | HAPS service links for IMT in Regions 1, 2, & 3 (per 5.388A) | Fixed | - |
| 2010 - 2025 MHz | HAPS service links for IMT in Regions 1 & 3 (per 5.388A) | Fixed | - |
| 2110 - 2160 MHz | HAPS service links for IMT in Regions 1, 2, & 3 (per 5.388A) | Fixed | - |
| 2160 - 2170 MHz | HAPS service links for IMT in Region 2 (per 5.388A) | Fixed | - |
| 47.2 - 47.5 GHz | HAPS (per 5.552A) | Fixed | - |
| 47.9 - 48.2 GHz | HAPS (per 5.552A) | Fixed | - |
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